JPH06190389A - Abnormality detectorof water treatment system - Google Patents
Abnormality detectorof water treatment systemInfo
- Publication number
- JPH06190389A JPH06190389A JP43A JP34576092A JPH06190389A JP H06190389 A JPH06190389 A JP H06190389A JP 43 A JP43 A JP 43A JP 34576092 A JP34576092 A JP 34576092A JP H06190389 A JPH06190389 A JP H06190389A
- Authority
- JP
- Japan
- Prior art keywords
- value
- meter
- error
- abnormality
- treatment system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は水処理システムにおける
異常検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device in a water treatment system.
【０００２】[0002]
【従来の技術】下水道システムにおいては、呼吸速度
（以下ｒrと称す）計，溶存酸素濃度（以下ＤＯと称
す）計を曝気槽内に設置し、これら各計測器により計測
された値を指標として曝気量の制御が行なわれている。2. Description of the Related Art In a sewer system, a respiratory rate (hereinafter referred to as r r ) meter and a dissolved oxygen concentration (hereinafter referred to as DO) meter are installed in an aeration tank, and the values measured by these measuring instruments are used as indicators. As a result, the aeration amount is controlled.
【０００３】[0003]
【発明が解決しようとする課題】上記のような下水道シ
ステムにおいては、往々にしてｒr計，ＤＯ計の異常，
散気板の目詰りなどが発生し、これが原因となって
ｒr，ＤＯの異常値が出力される。In the sewer system as described above, an abnormality in the r r meter and the DO meter is often detected.
Occurrence of clogging of the air diffuser, which causes abnormal values of r r and DO to be output.
【０００４】従来は、下水道システムには、この異常を
判断する機能がないため、操作員が制御状態やｒr計，
ＤＯ計の出力値より判断していた。このため、操作員が
異常状態に気づくのが遅れた場合，システムは異常値に
基づいて制御が行なわれるため、処理状態が悪化し、放
流水域の環境に悪影響を与える恐れがあった。[0004] Conventionally, the sewer system, because there is no function to determine the abnormality, operator control state and r r meter,
It was judged from the output value of the DO meter. Therefore, if it is delayed for the operator to notice the abnormal state, the system is controlled based on the abnormal value, so that the processing state may be deteriorated and the environment of the discharge water area may be adversely affected.
【０００５】そこで、本発明が目的とするところは、下
水道システムの異常を自動的に判断する装置を提供せん
とするものである。Therefore, an object of the present invention is to provide an apparatus for automatically judging an abnormality of a sewer system.
【０００６】[0006]
【課題を解決するための手段】本発明は、曝気槽内にｒ
r計，ＤＯ計を設置した水処理システムにおいて、ｒr計
によって計測されたｒr値と、ＤＯ計および水温をもと
に算出されたｒr値との相対誤差が一定値以上のときシ
ステム異常とする異常検出部を水処理システムに設けた
ものである。SUMMARY OF THE INVENTION The present invention is provided with an r
r meter, the water treatment system was installed DO meter, when the r r value measured by r r meter, the relative error between the DO meter and r r value calculated on the basis of the water temperature is higher than a certain value system An abnormality detection unit for determining an abnormality is provided in the water treatment system.
【０００７】[0007]
【作用】異常検出部は、ｒr値，ＤＯ値，水温およびＤ
Ｏ設定値などを入力し、ＤＯ計から得られたＤＯ値とＤ
Ｏ設定値との相対誤差が一定値以下のときｒrの計算値
とｒrの計測値から異常を診断する。The function of the abnormality detector is r r value, DO value, water temperature and D
Enter the O setting value, etc., and the DO value and D obtained from the DO meter
The relative error between the O settings to diagnose abnormal from the measured value of the calculated value and the r r of r r when the predetermined value or less.
【０００８】[0008]
【実施例】図１は本発明の一実施例を示したもので、１
は曝気槽，２は最終沈殿池である。曝気槽１には、流入
水と最終沈殿池２よりの返送汚泥が注入され、図示省略
された送風装置よりのエアーによって曝気される。最終
沈殿池２からは、処理水が流出し、また沈殿した汚泥が
余剰汚泥として引き抜かれる。３は異常検出装置で、こ
の異常検出装置３にはＤＯ設定器４によって設定された
ＤＯ設定値と、曝気槽への送付量信号が入力される。更
には、図示省略されているが、曝気槽１にはｒr計，Ｄ
Ｏ計および温度計が設置され、夫々の計測値であるｒr
値，ＤＯ値および水温値も異常検出装置３に入力され
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
Is an aeration tank, and 2 is a final settling tank. Inflow water and return sludge from the final settling tank 2 are injected into the aeration tank 1 and aerated by air from a blower (not shown). Treated water flows out from the final settling tank 2, and the settled sludge is withdrawn as excess sludge. Reference numeral 3 is an abnormality detecting device, and the DO setting value set by the DO setting device 4 and the signal to be sent to the aeration tank are input to the abnormality detecting device 3. Further, although not shown, the aeration tank 1 has an r r meter, D
An O meter and a thermometer are installed, and their respective measured values r r
The value, DO value, and water temperature value are also input to the abnormality detection device 3.
【０００９】作用説明に先立ってＤＯ，ｒr，送風量お
よび温度の関係について以下に示す。Prior to the explanation of the operation, the relationship between DO, r r , the air flow rate and the temperature will be shown below.
【００１０】溶存酸素濃度変化は（１）式によって示さ
れる ｄｃ／ｄｔ＝ＫLa×（ＣS−Ｃ）−ｒr・・・・・（１） ここで ｄｃ／ｄｔ：溶存酸素濃度変化 ＫLa：総括酸素移動係数 ＣS：飽和溶存酸素濃度 ｒr：呼吸速度 総括酸素移動係数は（２）式で示される。The change in the dissolved oxygen concentration is represented by the equation (1): dc / dt = K La × (C S -C) -r r (1) where dc / dt is the change in the dissolved oxygen concentration K La : Overall oxygen transfer coefficient C S : Saturated dissolved oxygen concentration r r : Respiratory rate The overall oxygen transfer coefficient is expressed by equation (2).
【００１１】 ＫLa＝ｋ１×ＧS k2×θ(T-14)・・・・・（２） ここで ｋ１，ｋ２：散気板などの特性により決定され
る定数 ＧS：送風量 θ：総括酸素移動係数に関する温度依存係数 Ｔ：水温 また、飽和溶存酸素濃度は、水温の関係式として（３）
式に示される。K La = k1 × G S k2 × θ (T-14) (2) where k1, k2: constants determined by the characteristics of the diffuser plate G S : air flow θ: Temperature Dependence Coefficient Regarding Overall Oxygen Transfer Coefficient T: Water Temperature The saturated dissolved oxygen concentration is expressed as a relational expression of water temperature (3).
Shown in the formula.
【００１２】ＣS＝ｆ（Ｔ）・・・・・（３） ここで、ＤＯがＤＯ目標値で一定に制御されていると
き、溶存酸素濃度化は零，すなわち（１）式の左辺ｄｃ
／ｄｔは零となる。この条件下で（１）式は、（４）式
のようなｒrの関係式となる。C S = f (T) (3) Here, when DO is constantly controlled at the DO target value, the dissolved oxygen concentration is zero, that is, the left side dc of the equation (1).
/ Dt becomes zero. Under this condition, the equation (1) becomes a relational expression of r r like the equation (4).
【００１３】 ｒr＝ＫLa×（ＣS−Ｃ）・・・・・（４） （４）式に（２），（３）式を代入すると、（５）式が
得られる。R r = K La × (C S −C) (4) By substituting the equations (2) and (3) into the equation (4), the equation (5) is obtained.
【００１４】 ｒr＝ｋ１×ＧS k2×θ(T-14)×（ｆ（Ｔ）−Ｃ）・・・・・（５） 本発明では（５）式の計算で得られたｒrと、ｒr計より
得られたｒrとの誤差より異常を診断するものである。R r = k 1 × G S k2 × θ (T-14) × (f (T) -C) (5) In the present invention, r r obtained by calculation of the equation (5) And the error from r r obtained from the r r meter is used to diagnose abnormality.
【００１５】図２は本発明による処理フローを示したも
のである。一般に、ｒr値の計測は３０分周期で行なわ
れるため、本実施例による異常診断も３０分周期で実行
するものとする。FIG. 2 shows a processing flow according to the present invention. Generally, the r r value is measured every 30 minutes, so the abnormality diagnosis according to the present embodiment is also performed every 30 minutes.
【００１６】ステップＳ１ではＤＯ計にて計測された値
ＤＯMESと、設定器４にて設定された値ＤＯSETとが比較
され、その誤差範囲が例えば±１０％のような所定値
（この値はＤＯ計の精度によって決定される）以内であ
るか否かが判断される。このときにおける誤差ＤＯABS
は（６）式によって求められる。In step S1, the value DO MES measured by the DO meter and the value DO SET set by the setter 4 are compared, and the error range thereof is a predetermined value such as ± 10% (this value Is within the range determined by the accuracy of the DO meter). Error DO ABS at this time
Is calculated by the equation (6).
【００１７】 ＤＯABS＝（ＤＯSET−ＤＯMES）／ＤＯSET×１００・・・・・（６） なお、誤差については、相対誤差，絶対誤差どちらでも
よいが、実施例では相対誤差で説明する。DO ABS = (DO SET −DO MES ) / DO SET × 100 (6) The error may be either a relative error or an absolute error, but in the embodiment, the relative error will be described. .
【００１８】Ｓ１での比較結果、相対誤差が所定値の±
１０％以外では処理終了となるが、以内の場合は、ＤＯ
がＤＯ設定値と略一致して制御されているものとして異
常の有無診断を行う。As a result of the comparison in S1, the relative error is ± of the predetermined value.
If it is less than 10%, the process ends, but if it is less than 10%, DO
The presence / absence of the abnormality is diagnosed on the assumption that is controlled substantially in accordance with the DO set value.
【００１９】ステップＳ２では、（５）式に基いてｒr
の計算値ｒrCALを求める。In step S2, r r is calculated based on the equation (5).
The calculated value r rCAL of is calculated.
【００２０】Ｓ３では、Ｓ２において求められた計算値
ｒrCALとｒrより計測値ｒrMESとの誤差ｒrABSを（７）
式によって算出し、その誤差範囲が例えば±２０％のよ
うな所定値（この値はｒr計の精度によって決定され
る）以上であるか否かが判断される。In S3, the error r rABS between the calculated value r rCAL and r r obtained in S2 and the measured value r rMES is calculated (7).
It is calculated by a formula, and it is determined whether the error range is equal to or more than a predetermined value such as ± 20% (this value is determined by the accuracy of the r r meter).
【００２１】 ｒrABS＝（ｒrMES−ｒrCAL）／ｒrMES×１００・・・・・（７） 誤差範囲が±２０％以内時には処理終了となるが、±２
０％以上時にはＳ４に移り、例えば６時間でｒrの相対
誤差が±２０％の状態が例えば６回以上，すなわち、異
常診断周期が３０分であることから，ｒr計測回数の半
分以上が±２０％以上の状態であった場合にはステップ
Ｓ５に移り異常メッセージ出力を行う。R rABS = (r rMES −r rCAL ) / r rMES × 100 (7) When the error range is within ± 20%, the processing ends, but ± 2.
Moves to 0% or more and sometimes S4, for example, 6 hours with a relative error of r r is ± 20% of the state, for example, 6 times or more, i.e., since the abnormality diagnosis period is 30 minutes, more than half of the r r number of measurements If the state is ± 20% or more, the process moves to step S5 and an abnormal message is output.
【００２２】異常状態を引き起こした原因としては、
（５）式のｒr計算式の変数より（Ａ）ＤＯ計の異常，
（Ｂ）ｒr計の異常，（Ｃ）送風量の異常，（Ｄ）プラ
ント特性データｋ１，ｋ２の不具合が考えられる。The cause of the abnormal condition is
From the variables in the r r calculation formula of (5), (A) DO meter abnormality,
(B) Abnormality of r r meter, (C) Abnormality of air flow rate, (D) Defects of plant characteristic data k1, k2 are considered.
【００２３】（Ａ）については、見掛状のＤＯ値は設定
ＤＯ値と略同じであるが、ＤＯ計の電極の汚れ、劣化等
により出力値が異常になっているおそれがある。Regarding (A), the apparent DO value is substantially the same as the set DO value, but the output value may be abnormal due to dirt or deterioration of the electrodes of the DO meter.
【００２４】（Ｂ）については、ｒr計の電極の汚れ、
劣化等により出力値が異常になっているおそれがある。For (B), the dirt on the electrodes of the r r meter,
The output value may be abnormal due to deterioration or the like.
【００２５】（Ｃ）については、散気板の目詰まりによ
る送風量の低下が考えられる。Regarding (C), it is considered that the air flow rate is reduced due to clogging of the diffuser plate.
【００２６】（Ｄ）については、プラント特性データの
設定値を見直す必要がある。Regarding (D), it is necessary to review the set value of the plant characteristic data.
【００２７】したがって、異常状態が生じた際には、
（Ａ）〜（Ｄ）の異常を出力し、制御が自動になってい
る場合には、手動にするよう促す。Therefore, when an abnormal state occurs,
When the abnormalities (A) to (D) are output and the control is automatic, the manual operation is prompted.
【００２８】[0028]
【発明の効果】以上本発明によれば、ｒr計，ＤＯ計の
異常，散気板の目詰りなどによるｒr，ＤＯの異常が自
動的に検出されるので、処理状態の安定が図られて放流
水域の環境に悪影響を及ぼすようなことがなくなるもの
である。As described above, according to the present invention, the abnormality of r r and DO meters, the abnormality of r r and DO due to the clogging of the diffuser plate, etc. are automatically detected. It will not affect the environment of the discharge water area.
【図１】本発明の一実施例を示す概要図。FIG. 1 is a schematic diagram showing an embodiment of the present invention.
【図２】本発明の処理を示す概略フロー。FIG. 2 is a schematic flow chart showing the processing of the present invention.
１…曝気槽 ２…最終沈殿池 ３…異常検出装置 ４…ＤＯ設定器 1 ... Aeration tank 2 ... Final sedimentation tank 3 ... Abnormality detection device 4 ... DO setting device
Claims (2)
および温度計を設置した水処理システムにおいて、前記
呼吸速度計によって計測されたｒr値と、前記溶存酸素
濃度計および水温の計測値をもとに算出されたｒr値の
誤差より水処理システムの異常診断を行う異常検出部を
設けたことを特徴とする水処理システムの異常検出装
置。1. A water treatment system in which a respiration rate meter, a dissolved oxygen concentration meter and a thermometer are installed in an aeration tank, and the r r value measured by the respiration rate meter, the dissolved oxygen concentration meter and the water temperature are measured. An abnormality detection device for a water treatment system, comprising an abnormality detection unit for diagnosing an abnormality in the water treatment system based on an error in the r r value calculated based on the value.
と溶存酸素濃度設定値との誤差が予め定められた所定値
以内のときに呼吸速度値を算出する呼吸速度値算出手段
と、この算出手段によって求められた呼吸速度値と呼吸
速度計にて計測された呼吸速度値との誤差が予め定めら
れた値以下であるかを判断する誤差判断手段と、この判
断手段での誤差が所定値以内のとき決められた時間内で
の誤差発生回数を検出し、規定回数以上時に異常メッセ
ージを出力する異常出力発生手段とを備えたことを特徴
とする請求項１記載の水処理システムの異常検出装置。2. The abnormality detection unit includes a respiratory rate value calculating means for calculating a respiratory rate value when an error between the detected value of the dissolved oxygen concentration meter and the dissolved oxygen concentration set value is within a predetermined value. An error judgment means for judging whether the error between the respiration rate value obtained by this calculation means and the respiration rate value measured by the respiration rate meter is a predetermined value or less, and the error in this judgment means The water treatment system according to claim 1, further comprising: an abnormal output generating unit that detects the number of error occurrences within a predetermined time when it is within a predetermined value and outputs an abnormal message when the number of errors is equal to or more than a specified number. Anomaly detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP43A JPH06190389A (en) | 1992-12-25 | 1992-12-25 | Abnormality detectorof water treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP43A JPH06190389A (en) | 1992-12-25 | 1992-12-25 | Abnormality detectorof water treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06190389A true JPH06190389A (en) | 1994-07-12 |
Family
ID=18378791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP43A Pending JPH06190389A (en) | 1992-12-25 | 1992-12-25 | Abnormality detectorof water treatment system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06190389A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006257487A (en) * | 2005-03-17 | 2006-09-28 | Jfe Steel Kk | Liquid concentration controlling method |
| JP2018143760A (en) * | 2017-03-07 | 2018-09-20 | マツダ株式会社 | Viewing state determination device |
-
1992
- 1992-12-25 JP JP43A patent/JPH06190389A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006257487A (en) * | 2005-03-17 | 2006-09-28 | Jfe Steel Kk | Liquid concentration controlling method |
| JP4635665B2 (en) * | 2005-03-17 | 2011-02-23 | Ｊｆｅスチール株式会社 | Liquid concentration control method |
| JP2018143760A (en) * | 2017-03-07 | 2018-09-20 | マツダ株式会社 | Viewing state determination device |
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